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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952003ff3dcd8b886c0a8ff10123e774e25ea1c4aa01c5779ce02e504a3bb7b3' 
  AND token = 'flo3hXmHJGcwMrbRZONlDI6T1biSJOeofo/1iBXxKTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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