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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '194cbd65e46d3c754352ab21e79047908408e1d290e207b6f8f365be925ec949' 
  AND token = 'LwMzyqcbv7v09nolYPqC10pOYW3jXMLozG+ivPmQQ2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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