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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b0337d0f0a5560bf45fa5bc8d5db105975dabf8265b6e384b0fb034b27bcd5a' 
  AND token = '3710Io7T7xbRVSW8kGTZF2++Set6x8T/yiBHbSb61n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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