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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ca9f589f7f2d81981a0ba6231a2633b118104955f910a046118e2b93a35fa6' 
  AND token = '/HKQVWD3DfR+WTX2Vtam43OlLieR6wm8rPkZ2WPton0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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