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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdcd576ed20a8ea733316926ce084a482a232587020406a1d1117ff1fedc38db' 
  AND token = 'VkWhwULirQeu7z54CmBrtdU481EDHCJa405NOGu3OG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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