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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ba31ac272035f4c7ab16bf703e17d4539b7a2935387eb9c5ebc3e9e4a99c36' 
  AND token = 'MWQHaPeJnSDh8B2eYn2e6NEuOnmPkrqogkCaELfzcHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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