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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfde6fcbf67448ede6cbb9b70ccdaab5b837330b025156604d283edd43b5c057' 
  AND token = 'u6OefFuwqt1kbQ5v7lZtP9vSxzFgQzaYQ/EC8ql0Oz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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