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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '651170641e2de568a94bf97229e31ccdc9c03b2ef9270a3c1adbe1032043dc7d' 
  AND token = 'xgjymidSxacxWK5+DtRfjIdCyr7lGbq631pB5lYtb2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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