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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc69b3e864c146acdf706be7feeb57ff0469afdc67b1e64bbcb8709a04884919' 
  AND token = 'GNf4py4YDPJYEKe8IivJ+ZsnXTAKEaOQSFeypEHLaw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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