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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9863fc32a4513c7bf4dd507b478a123c5de2f1bc783d0d6c2865749ba2c1a804' 
  AND token = 'Z4lZzEsx9Nq3hfIRa0XYg3KTkG0s0FA5oqdBAfkoHKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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