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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d15042a125b4ff88489fc1fb8ca1b9e7bc61f20155d06de57dde43cec809ec5' 
  AND token = 'A2xhKcA7kaADiQx9j5zqvXqvGQnDI/bdqhd0xbXPX9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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