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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a3f871c1e01b45d367c88329e936b09769f286828dd51072e99aba7e5bc622' 
  AND token = 'klJzB8PKKG5nLSYi3rBg+dg1AX9i1CrcyDL8lB3SZok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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