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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df97b21b65538ae3ef558dce940e00729c8e551be6ac7b0575bd24668831236e' 
  AND token = 'd/fRcXI9Zp59h/tOVfYaXP9cS4oqRmFuj/A7L9sRMNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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