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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc31e49394e4f4a432f7aaef1872d964106b342998c2a6c0eeecf7336ea02de0' 
  AND token = '9oxw5/Z1DRDK9ATue9eOSntgXvoNtAp7AeLRcvlTJho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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