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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57705aa2616e6d92aaee9617968901f72bc422d66afbf15a693ea62dec6ae65d' 
  AND token = '2UrkPswz5BRP+9/1eAWideDjl7SRKlZguLLFqaKkQHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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