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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82988b7111d682567f4d9a1debb1c6656d482b9015afc81391d2db4af9d7db13' 
  AND token = 'mCn+tW3XSnP9LfANrI1DUVSJlT9AMYjRcDh3qt8wYUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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