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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003fc95aab8cf23bb425a24021cce766d5998bed0d5cf03ee60d1a758ca79ae0' 
  AND token = 'OzW/J8BuPaGhvkqb31wzpfojEU8NzymwUhnNu9TZwi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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