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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc39de10a809283e076e153cf0cfd4cd0098f83d9c62d508a9c18b5cad5c8e06' 
  AND token = 'gPKa8L1ELHxWiKPORivsOqvgOpn4E+dnQjhUl2nklr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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