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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c5e4177b2308917ebd32ec39dd7bf5f6a3297ae6c7adf02832d3bf7b55107e' 
  AND token = 'FjMiqfO79Vldkb1AsuMoYSRAp6FHxiKX8xed79/GpTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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