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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '588ada2bfe5bc9b57fd027fa2ebba58dcd5b6fe988d9c7411e58a693e3650f58' 
  AND token = 'MOjET30UVLetKJqD7w54hF3OqHFWh2dHNhEQyUxZ3rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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