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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984fc2d5c88eaed7feae282aa6b6889562283dcbab81f958ded89f1e628e0deb' 
  AND token = 'eDphnEe8WTsw9K8RaLD9PLvgrl7WQ3b6R65p+Ps6FYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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