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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d756c2195ba3c40ef09311c8a6ff037a1040e3a3615fb61cb63d5a711d50c2' 
  AND token = 'eI451Hn8OU6AMuUvDKzpKSA2RezXrRmZNn1vn5asEp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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