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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '105f545ecd060782b72599a91993a92d1c9ad7929b3a4ad9e76ca352cc7e7045' 
  AND token = 'hBFDKPovkPzxeha2ZMsKXCrfzuOKk8JT4t53wgJpjSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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