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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2f193941d82439f7b3b4a934641897b7419a05685740d191bf038d9e5c75c0f' 
  AND token = '95++ktwxDqb190muFVml8Hn9VmlpN1+b3LHcfenDBhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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