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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6039d3fc60f3d0b7a4eaf97facaf3f7bf28e82fdb8eb16dc2c465bcff9481197' 
  AND token = 'G06au/4XhG87TR93I8pTVm4E4JTAafY3mf8J+KtH7mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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