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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e81d8ebfe0c8bd7d43dfa39b96b7d1d33c75a747d8892a34ada6fb56b503d860' 
  AND token = 'PSqOcdYODXCVLFgXZmfDEZquDZm2i1s9ZONJNeHeaJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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