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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '272035dee0c95a913751d772af2fe91108b683d9e1d05bc3f520645aaf37ca39' 
  AND token = 'VvFLf9w2Z2rJSiRXBec94eoWfEhz4r5Pp1sGKRY/t84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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