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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372d9f7fbbf4fd5e12293ee14b01075876c2842f89f0883a20d9dd5f845c8b60' 
  AND token = '+uBbWZuy6BReNbzHe5XkmK7dWlb7nqs7bdYY7bqX5Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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