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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6047d04bc21ad6fd4b7fdacfbb4d18644f4a55ce71d7ff74e3369c46a797297' 
  AND token = 'NLQQ+Pq3R6RKf8ep1Crn22J8qvAVZlnCD/s8dAeB2SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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