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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38dfa37c804448cc3916c9eacb03fdd6ec1cae28a67d02e57b76f78be5c24d99' 
  AND token = '2zICWw9cJ+/19Tee/U1fIdqYJW0Zk3Lm+nfajprmJWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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