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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7adff92f4dca34c9a197511cd15b4a5903edb929d7820923aaae4cf1180903d' 
  AND token = 'fK+5ih2fj5zgw495pySVFtcJyx2r3N7b353pjfpMuM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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