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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '516589bd66c730dd331a1ee7d5263d7dcd2ccd3097c2578f30c3112065d3c6f6' 
  AND token = '6eoyaR4K1inM7AOuwl9dalxJSsuTxQicmV3YFRf+4qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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