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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f89cbd73224279b3d1697a2a7d0e307470a6dbba2dd0f3cb6061e3836ff941a' 
  AND token = 'P68W1WtVeXudoR1YnUIJ25w4tkLzJ9/H6yyjfo0B65o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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