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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a7547dbb6c1987f74c2805f22bda995f021a93bf2ddc8c09005d9639560e47' 
  AND token = 'uASK8SCaaEV1dUMP30gXskw4MxM7iRknH63YOdD42r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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