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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6a7247d512ffa483ef446189c3236549522a0fb229f102fa18a609d9ec3d5c' 
  AND token = 'lKqSWtIqxVlQNkonH5yn3g7dP12LMDHIjXRC4rtexng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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