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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87cd25641478a42d362ee7adf600db59c5f6a42b8c3120087988151c64d2734c' 
  AND token = 'mvB5V87d1Ivr6rnZhugQmebwh6c6em9xCy7li9w8rlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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