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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc33752a4574bb31ef38db69c93dcf3d31b326ff0eb4716d3e0c7d2d9fc1b6d5' 
  AND token = 'EhxXPuk/FMxsidvGQNk/1RulGZ5REeUUoh5vLAeKAPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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