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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3ca4f11dc8f024c3fc86cd64e6324fddc7167755f08a957a01c37b13d1e064' 
  AND token = '/07QGdx9FaztK0jSB8B8ro/r7dzT5l1mytKVNMLxgLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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