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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88f4820295cb6ac27f57d2ece555efc7c945916ca159b240381862e308c5a17' 
  AND token = 'a1k9vqDAqs6wmnyy4SIwYDrExQD7QA79sAnWbaenVfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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