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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c633cdc3e3b7b0bf42c13583d6fed8e31f9663515380a4e39fe408a40237cb' 
  AND token = 'iGUkZT3dtC95/FoJY3m1RmpZSa/UgCJ8u2Q4grlU6P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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