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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06930956c18994badbca4a3e86c58d7ec258400b06fb162b95995d91f82a405' 
  AND token = 'Ha2UG3vq1oOx3u9kHXKfQKRN0Pfm60d+2SWTx/mNhW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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