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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dabe04221f8e3ad9f693682d09a6542629685cfdda26380eed44ffa30c6a535a' 
  AND token = 'cJmqAOsJd9aW63V8lFEkogyj/MayJinPhdki9dmC16Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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