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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0f5c286bce49fe2b232199d59937220219ab8d7c3b418cbb18ea09e9fd434d' 
  AND token = '+xwT63+23ImphWmFbC4EhL51tS3MYmAyxoH/Sos+kL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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