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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c085c0feaa91f602675084f6d0550efe90eb01829bd93889c1a843f7cb694e97' 
  AND token = 'ctuJC6t5NCf1uoXAc0jTfSyhCaCIpTfoTFS8U2/5rE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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