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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9bcea21cbf5dd03c203c73318c26b8bb5eae30198b11674804f229dd745e888' 
  AND token = 'Kg2f2ee10yhAsYY4rrZTzk/23q0PK6LKLSHLr4jOn2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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