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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2fec5234c6f887fb9ce687e9269ebe3476c19612b7598b1401d54d6f1873c80' 
  AND token = 'YkzslwsQOzK2YSrnE2w1B9Qpte6iYzMXR9R69pkS1dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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