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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05786799adbd90e74861822d316792081eed69d89c504e61b0740305f3408bf5' 
  AND token = 'Och2g9M4Wx1BAVmYtPlzBojSTLO7MvBd947VxOh6BbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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