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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e19b2d9d387fb88101e377494bb6495486cf76db1906ea81b911689a9ab1ca' 
  AND token = 'ACmLuMMIiwsouApo5Nn+z6nJ2MFWlU9Yd48feca/eZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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