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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d72136a6092e2703b2686c343a5035195a87abd397fddf34d268002e4c9b681' 
  AND token = 'e1hAUu426RN5eo0N0Nnb6wn2doJ5CqxDQKn+NFS6A5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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