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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f13c3dfbeb31b067fa2b3887a2ef345391bf7bd4e7f7ede2763245067d4b1cc' 
  AND token = 'y1CJ9Do/sodi4SaiJk3i7D9pnaHO7LDOAAroCRns648=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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