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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f553229924849c28a31f715a375b9f67176e96153a82cd8082114ea09a9c37' 
  AND token = 'A8wjFYt1/TcbvGaJ2R3vvmviPUSsyxxbydV87UmUzW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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