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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe6e1d1132af344a035a16684c4ac440a95e49a345f778eb1f5d53fafbe7c6fb' 
  AND token = 'ekkUAkvHfcqZV0l/l1hH87RWkDyW0YtQGUNv2uvNulE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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