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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6d3b23569ae88b58439fc696f9f82dfc6b06d0b0c8de7f75bfee4999183bff1' 
  AND token = 'kyLXstYcNXDKoVg6X8WExd4zNu5wacS9LJTmm7UOQ+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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