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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac4f480c1b91f441d5a9386f3a19a24e50decc6170fd59655c3180fb3bb0f98' 
  AND token = 'dVvi3ti0+MZa8XY1RbCj3X5Iq1FAB8l9u5Zx/cf8PT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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