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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8764c242fa14cf98c37d94be9cac94e39f422697828e346969ee4a319fe8120' 
  AND token = 'D0LZi9Z3qS27I0D227D8eEAV4QrBHKjBMeeofGCcpKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}