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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee59e14bd5f6c41a33fb8c31eadc290daef31cf4b0f5f109e6f2dd7fd6ef489' 
  AND token = 'd8ISO8wyObLkAHdYRdTZ5QfcjKeMAchiv6dCnultGHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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